Portable electric saw



Dec. 14

A. CLARKE PORTABLE ELECTRIC sAw Filed May 51, 1925 2 Sheets-Sheet 'l art vented, 4462,4555.

Dec. 14 1926.

A. A. CLARKE PORTABLE ELECTRIC SAW Filed May 31, 1923 I 2 Sheets-Sheet 2 PR Q Patented Dec. 14, 1926.

UNITED STATES max A. stanza, or cnrcaeo, rumors.

ron'ranrn nmacrnrc saw.

Application filed May 81,

This invention relates to new anduseful improvements in portable electrlc saws The object of the inventionis to provide a portablettnotor'driven saw in the form of a hand tool which may be easily and Sklllfully handled by the workman.

Another object of the invention is to pro-. vide a tool having a self-contained electric motor and which. may beslid along the work like an ordinary bench plane.

A further object of the invention is to provide a vertical revolving saw driven by the motor together with means for adj ustmg the saw with relation to the work without interrupting the driving of said saw.

An imporant object of the invention is to rovide inconnection with a vertical revolving saw an elongated housing having a flat work engaging'basethrough which the work is exposed to the saw and whereby the depth of the cut of the saw may be accurately.

controlled.

A construction designed to carry out the,

invention together with other particular features will be hereinafter described.

The invention will be more. readily understood from a reading of the following specification and by reference to the accompanying drawings, in which an example of the invention is illustrated and wherein:

Fig. 1 is a side elevation of the saw constructed in accordance with my invention,

Fig. 2 is a plan view of the same, Fig. 3 is a horizontal cross sectional view taken on the line 3-3 of Fig. 1, 1

Fig. 4 is a side elevation of a modified form of the invention,

Fig. 5 is. aplan view of the same, Fig. 6 is a partial vertical sectional view of the front end of the saw,

j Fig. 7 is a detail of the adjusting means, Fig. 8 is a cross-sectional view taken on the line 8-8 of Fig. 7, and

f Fig. 9 is a horizontal cross-sectional view onthe line 9-9,of Fig. 4.

In the drawings the numeral 10 designates an elongated housing having vertical. side {walls 11 and a transverse partition 12. At

[the rear end of the housing a vertical handle 113 is mounted and the front end of the flat base 14 of the housing is extended. Within the housing between the partition and the rear wall is suitably mounted an electric I motor 15 having its armature shaft extendthe base. For holding 1923. Serial No. 842,695.

ing forwardly through said partition and having a beveled plinion 16 fastened thereon. The pinion mes es with a beveled car 17 mounted on a counter shaft 18 w ich is journaled in a bracket 19 carried by the base. A gear 20 having a greater diameter than the gear 17, is fastened on the outer end of the shaft 18. .An adjusting yoke 21 is ournaled on the side walls 10 on trunnions 22, which latter are axially alined with the axis of the shaft 18 and the, gear 20.

' Slots 23 are cut in the side walls concentric to the trunnions and a saw shaft 24 extending across the housing and through the slots, is journaled in the lower ends ofthe yoke. A. pinion 25 fastened on the shaft 24 meshes with the gear 20 and is driven thereby. The pivot of theyoke being concentric to the gear 20 it is obvious that when the yoke is swung to raise or lower the saw shaft 24, the pinion 25 will constantly remain in mesh with the gear. the saw shaft may be adjusted without interrupting the transmission of motion thereto.

Aslot 26 is formed in the base 14 and a circular saw 27v mounted on the shaft 24 is adapted to project through said slot and' engage the work. The depth of the cut of the saw is regulated by its projection below the yoke in adjusted positions a central unger 28 is mounted in the bore of a' han le 29 and placed under the tension of a coiled spring 30 confined in said handle. A toothed segment 31 concentric to the pivots-of the yoke is mounted on top of the housing in position to be engaged by the plunger, wh1ch has a reduced By this arrangement point for this purpose. A pin 32 passing through the plunger extends through slots 33 in the handle. By grasping the handle and engaging the pin with the fingersthe plunger may be ralsed and the yoke swung 34 mounted inthc handle 13 so as to be easily operated by the workman for stopping and starting the motor.

.to raise or lower the saw. An electric switch Any. desired attachments may of course be made to the housing. Owing to its broad flat base 14 the housmg will remain level on the work and make for accuracy. Various changes in the parts as well as modifications and alterations may be made within the scope of the appended claims. 7

'As an illustration of such modifidation I have shown in F igs.-4 to 9 another form of the invention. This form includes a comparatively short housing right side walls 11 and a dome 35 in which the motor 15 is mounted vertically instead of horizontally as in the first instance. A handle 13 is connected with the housing and has a switch 34'.

Opposed vertical recesses or guides 36 are formed in the forward portions of the side walls and provided with vertical slots 23 in their bottoms for receiving a transverse saw shaft 24. An upright yoke 21 straddles the housing and engages in the guides and has a central handle 29. The saw shaft. is journaled in the lower ends of the yoke. A circular saw 27 is fastened on the shaft and projects through a slot 26' in thebase 14' of the housing. For raising and lowering the yoke the handle 29' is employed and this handle is mounted to rotate in the yoke as is shown in Fig. 7. On its lower end within the. yoke the said handle has a disk 37 (Fig. 8) provided with diametrically opposite cars 38 pivotally connected with the inner ends of detents 39 mounted on screws 10, whereby they are piv eted and suspended from the yoke. The detents have slots 41 receiving the screws so as to be moved longitudinally. Vertical posts 42 mounted on top of the housing penetrate theyoke and are provided with teeth for receiving the ends 0 the detents, whereby the yoke is supported in the positions to j which it is adjusted vertically.

By turning the handle'29' in a counterclockwise direction the detents are withdrawnfrom the teeth of the posts and the oke may be adjusted vertically to raise or ower the saw. When the handle is turned in a .clockwise direction the detents are moved into the teeth and the yoke fastened .in position. For driving the saw shafta imon 43 is, mounted horizontally on the ower end of the vertical armature shaft of the motor. This pinion drives a gear '44- which in turn drives meshing pinions 4.5 and 46 respectively. The pinion 46 is fastened to the bottom of a vertical worm 47 mounted in a bracket 48 on upper side of the base 14'. A pinion 49 fastened on the saw'shaft 24' meshes with the worm which latter is long enough to permit ample vertical adjustments of the saw shaft without disconnecting the pinion from the worm. In using the saw the operator grasps the handle 13' and moves the device onto the 1. In a portable electric saw, a housing,

an elongated base under the housing having a slot, a motor mounted in the housing, a

10' having up-.

yoke at the exterior of the housing and vcrtically adjustable on the housing, a saw shaft carried by the yoke and extending through the housing, a saw mounted on the shaft within the housing and located to project through the slot in the base, a driving connection betweenthe saw shaft and the motor remaining constant during adjustments of the yoke, and means for fastening the yoke in adjusted positions.

2. In a portable electric saw, a housing, an elongated base under the housing having a slot, a motor mounted in the housing,,'a handle on one end of the housing, a yoke at the exterior of the housing and mounted to move vertically on the housing, said housing having vertical slots, a transverse shaft carried by the yoke and extending through the slots of the housing, a vertical circular saw within the housing and fastened on the shaft, a pinion on the shaft, a train of gears between the motor and the pinion in constant engagement, and means for fastening the yoke in adjusted positions.

In a portable saw, the combination with an elongated housing having a flat base and provided with a slot through the said base, of a shaft extending through the walls of said housing, the latter being slotted for the reception of the ends of said shaft, a saw mounted on said shaft and adapted to be projected through the slot of thebase, a motor within the housing, gearing connections between said motor and said shaft, an operating yoke at the exterior of the housing and spanning the same, said yoke being connected to the ends of said shaft for adjusting the latter in the slotted sides of the housing, whereby to adjust the degree of projection of the saw through the housing, and means whereby said yoke may be held in adjusted position with respect to the housing.

4. ,ln a portable saw, the combination with an elongated housing having a flat base, the latter being provided with a slot, the sides of said housing also being provided with aligned slots, of a shaft extend- -ing transversely through the said housing and having its ends projecting through the slots of the sides of the housing, a

saw mounted on said shaft within the housing and adapted to be projected through the slot of the base, a motor located within said housing, a yoke arranged over the'housing and spanning the sides'thereof, said yoke being connected to the projecting ends of said shaft, means for adjusting said yoke with respect to said housingto vary the de-' gree of projection of the saw through the base, and gear connections between said motor and said shaft.

5. In a portable saw, the combination having a flat base,

with an elongated housing h 1 h wit a s at, t e

the latter being provide shaft arranged within said housing and projet-ting through the slotted sides thereof, a saw mounted on said shaft and. adapted to r be projected through the slot of the base, a

yoke arran ed at the exterior of the housing and spanning the sides thereof said yoke being connected to the projecting ends of said shaft, said yoke being adjustable with respect to the housing, whereby to var the degree of projection of the-sawthrougl the housing, means for locking said yoke in its positions of adjustment with respect to the housing, a. motor located within the housing, and gearing connections between said motor and said shaft, said connections including provision for adjustment of the saw w 1th respect to the housing without disturbing the driving relation of the motor to the saw in the different positions of adjustment of the latter. v

6. In a ortable saw, the combination with a housing aving an elongated base and provided with a slot. therein, said housing being provided with a partition extending transversely thereof and providin compartments in the housing, a shaft exten ing transverse 'ly through one of said compartments, the

walls of said compartment being provided with slots through which the-ends of said shaft project, a motor also arranged in one of the compartments of said housing and having its armature shaft projecting through said partition a saw mounted on said transversely exten in shaft and adapted to be projected throng the slotof said base, a

oke spanning t e outside of said casing and aving its ends pivoted at the exterior of the casing and also connected with .the pro-, jecting ends of said transverse shaft, whereby to vary the degree of projection of the saw through the slot of the base upon movement of said yoke with respectto the housing, means for locking the yoke in its-different positions of adjustment, and gearing connections between said motor. and said transverse shaft for driving the latter from the motor.

7. In a portable saw,'the combinationwith a housing having an elongated base and provided with a slot therein, said housing being provided with a partition extending transversely thereof and providing compartments at either side of the same, a shaft extending transversely ofthe compartment in advance of said partition, thewalls of said compartment being provided with slots through.

which the ends of said shaft project, a motor arranged in the compartment in rear of said artition and having its armature shaft proecting through the partition, a saw mounted on said transversely extending shaft and adapted to be projected through the slot of said base, a U-shaped'yoke spanning the outside of said casing and having its ends pivoted on the side walls-thereof and connected with the projecting ends of said transverse v shaft, whereby to vary the degree of projection of the saw through the slot of the base upon movement of said yoke with respect to the housing, a train of gearing arranged in the compartment wherein the saw is located and affording driving connections between said transverse shaft and the armature shaft of said motor, and means for locking the yoke in its different positions of adjustment with respect to the housing. 7

8. In a portable saw, the combination with a housing having an elongated base and pro vided with a slot therein, said housing being provided with a partition extending trans the same, the ends of said yoke being pivoted on the side walls of the housing and connected with the projecting ends of said transverse shaft, whereby to vary the degree of projection of the sawthrough the slot of the base upon movement of said yoke with carried by the housing, and latchingmeans carried by the yoke and co-operating with the tigmental rack forlocking the yoke. in o its di erent positions of adjustment, a trainof gearing arranged in the compartment wherein the saw is located and affording driving connections between said transverse shaft and thearmature shaft of said motor, and means carried by the'housing for guiding the saw with respect to-the work.

In testimony whereof I aflix my signature.

ALEX A. CLARKE.

respect to the housing, asegmental rack 

